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PDF ISL29044A Data sheet ( Hoja de datos )
| Número de pieza | ISL29044A | |
| Descripción | Low Power Ambient Light and Proximity Sensor | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29044A
The ISL29044A is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED and I2C Interface
(SMBus Compatible). This device uses two independent ADCs
for concurrently measuring ambient light and proximity in
parallel. The flexible interrupt scheme is designed for minimal
micro-controller utilization.
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range up to
3200Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz
flicker noise caused by artificial light sources.
For proximity sensor (Prox) data conversions, the built-in driver
turns on an internal infrared LED and the proximity sensor ADC
converts the reflected IR intensity to digital. This ADC rejects
ambient IR noise (such as sunlight) and has a 547μs
conversion time.
The ISL29044A provides low power operation of ALS and
proximity sensing with a typical 133μA normal operation
current (108μA for sensors and internal circuitry, ~25μA for
LED) with 220mA current pulses for a net 100μs, repeating
every 800ms (or under).
The ISL29044A uses both a hardware pin and software bits to
indicate an interrupt event has occurred. An ALS interrupt is
defined as a measurement that is outside a set window. A
proximity interrupt is defined as a measurement over a
threshold limit. The user may also require that both ALS/Prox
interrupts occur at once, up to 16 times in a row before
activating the interrupt pin.
The ISL29044A is designed to operate from 2.25V to 3.63V
over the -40°C to +85°C ambient temperature range. It is
packaged in a clear, lead-free 8 Ld ODFN package.
Features
• Internal LED + Sensor = complete solution
• Works under all light sources including sunlight
• Dual ADCs measure ALS/Prox concurrently
• <1.0μA Supply current when powered down
• Temperature compensated
• Pb-Free (RoHS compliant)
Intelligent and Flexible Interrupts
• Independent ALS/Prox interrupt thresholds
• Adjustable interrupt persistency
- 1/4/8/16 consecutive triggers required before interrupt
Applications
• Display and keypad dimming adjustment and proximity
sensing for:
- Mobile devices: Smart phone, PDA, GPS
- Computing devices: Laptop PC, Netbook, Tablet PC
- Consumer devices: LCD-TV, digital picture frame, digital
camera
- Industrial and medical light and proximity sensing
Related Literature
• See AN1436, “Proximity Sensors”
V_LED
V_PULLUP
I2C SLAVE 0
5 LED- LED+ 4
6 IRDR GND 3
7 INT SCL 2
8 SDA VDD 1
ISL29044A C1
0.1µF
C3
0.1µF
R1
RES1
VDD
I2C SLAVE
1
I2C
SLAVE_n
C2
1µF
SCL
SCL
SDA
SDA
I2C-DIAGRAM I2C-DIAGRAM
R2
RES1
R3
RES1
I2C MASTER
SCL
SDA
INT
CONTROLLER
FIGURE 1. TYPICAL APPLICATION
100
90
80
70
60
50
40
30
20
10
00
110mA GREY
20 40
220mA WHITE
110mA WHITE
220mA GREY
60 80 100 120 140
DISTANCE (mm)
FIGURE 2. PROXIMITY RESPONSE vs DISTANCE
160
April 28, 2016
FN8419.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2013, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29044A
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C (Note 9). (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN MAX
(Note 6) TYP (Note 6) UNIT
tSU:STA
Set-up Time for a Repeated START Condition
tHD:DAT
Data Hold Time
tSU:DAT
Data Set-up Time
tR Rise Time of both SDA and SCL Signals
(Note 10)
tF Fall Time of both SDA and SCL Signals
(Note 10)
tSU:STO
Set-up Time for STOP Condition
tBUF Bus Free Time Between a STOP and START Condition
Cb Capacitive Load for Each Bus Line
Rpull-up
SDA and SCL System Bus Pull-up Resistor
Maximum is determined by tR and tF
tVD;DAT
Data Valid Time
tVD:ACK
Data Valid Acknowledge Time
VnL Noise Margin at the Low Level
VnH Noise Margin at the High Level
NOTES:
9. All parameters in I2C Electrical Specifications table are guaranteed by design and simulation.
10. Cb is the capacitance of the bus in pF.
600
30
100
20 + 0.1xCb
20 + 0.1xCb
600
1300
1
0.1VDD
0.2VDD
ns
ns
ns
ns
ns
ns
ns
400 pF
k
0.9 µs
0.9 µs
V
V
FIGURE 3. I2C TIMING DIAGRAM
5
FN8419.3
April 28, 2016
5 Page 
ISL29044A
BURST READ
Burst read operation is identical to the Byte Read operation.
After the first Data byte is transmitted, the master responds with
an acknowledge, indicating it requires additional data. The
device continues to output data for each acknowledge received.
The master terminates the read operation by not responding with
an acknowledge but issuing a STOP condition (refer to Figure 21).
For more information about the I2C standard, please consult the
Philips™ I2C specification documents.
SIGNAL FROM
DEVICE ADDRESS
MASTER DEVICE START
WRITE
ADDRESS BYTE
DEVICE ADDRESS
START
READ
SIGNAL AT SDA
SIGNALS FROM
SLAVE DEVICE
10001000
A
C
K
10001001
AA
CC
KK
FIGURE 20. BYTE ADDRESS READ SEQUENCE
DATA BYTE
STOP
SIGNAL FROM
MASTER
DEVICE
DEVICE ADDRESS
START WRITE
ADDRESS BYTESTARTDEVICREEAADDDRESS
DATA BYTE 1
DATA BYTE 2
DATA BYTE n
STOP
SIGNAL AT
SDA
SIGNALS
10001000
A
10001001
AA
A
A
FROM SLAVE
CC
C C C (“n” is any integer
DEVICE
KK
K K K greater than 1)
FIGURE 21. BURST READ SEQUENCE
11 FN8419.3
April 28, 2016
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL29044A.PDF ] | |
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